AARP Medigap Plans: What They Are and How They Work 🏥

If you're turning 65 or already on Medicare, you've likely heard about AARP Medigap plans. They're advertised heavily, and for good reason—supplemental insurance fills gaps that Original Medicare leaves behind. But understanding what these plans actually cover, how they differ, and whether they fit your situation requires looking past the marketing.

What Is a Medigap Plan?

Medigap (also called supplemental insurance) is a private insurance policy designed to cover costs that Original Medicare—Part A and Part B—doesn't pay. Medicare covers a significant portion of your healthcare expenses, but it doesn't cover everything. You're responsible for deductibles, copayments, and coinsurance. Medigap policies pick up some or all of these out-of-pocket costs.

AARP doesn't actually sell Medigap plans directly. Rather, AARP endorses plans sold by insurance companies like UnitedHealthcare, Cigna, and others. When you see "AARP Medigap," you're buying a standardized plan underwritten by an insurer, with AARP's branding and endorsement involved.

How Standardized Plans Work

This is important: Medigap plans are standardized by federal law. That means a Plan G sold by Company A covers the exact same benefits as a Plan G sold by Company B. You can't find a "better" version of Plan G—only a cheaper or more expensive one.

The standardized plans are labeled A through N (with some regional variations). Each letter represents a different combination of benefits. For example:

• Plan A covers the basics: Part A deductible, Part B coinsurance, and blood transfusions
• Plan G covers nearly everything except the Part B deductible (and is one of the most popular choices)
• Plan N has more modest coverage but typically lower premiums

The specific benefits each letter covers are fixed by law, not by the insurance company or AARP.

The Variables That Shape Your Decision 📊

Several factors determine which plan—if any—makes sense for your situation:

Your healthcare usage. If you see doctors frequently, anticipate hospital stays, or have ongoing prescriptions, comprehensive coverage (like Plan G) may save money despite higher premiums. If you're generally healthy and visit the doctor rarely, a less comprehensive plan might cost less overall.

Your budget for premiums. Lower-letter plans (A, B, C) have lower monthly costs but leave you with more out-of-pocket expenses when you use care. Higher-letter plans cost more upfront but protect you better from surprise medical bills.

Your age when enrolling.Medigap premiums are typically calculated using one of three methods: age-attained (your premium rises as you age), issue-age (locked to your age when you enroll), or community-rated (same for everyone in your area). The method used varies by insurer and state, so the total cost over time differs significantly.

Your state. Medigap rules, available plans, and pricing vary by state. Not all plans are available everywhere, and pricing structures differ.

Your prescription drug needs.Medigap doesn't cover prescription drugs. You'll need a separate Medicare Part D plan (prescription drug coverage) or a Medicare Advantage plan that includes drug coverage. This is a critical separate decision.

AARP-Endorsed Plans vs. Other Insurers

AARP-endorsed Medigap plans are sold through specific insurers but carry AARP's name recognition and endorsement. This doesn't mean they're inherently better or worse than non-AARP plans covering the same standardized letter. The benefits are identical by law. What differs is the premium price, customer service reputation, and marketing reach.

Some AARP members report brand loyalty and ease of enrollment through AARP. Others find cheaper options elsewhere for the exact same coverage level. Since the benefits don't vary, comparing quotes across carriers—AARP-endorsed or not—is the practical way to find the best price for your situation.

What You Need to Know Before Choosing

The enrollment window matters. You have a 6-month Medigap Open Enrollment Period starting the first day of the month you turn 65 and are enrolled in Medicare Part B. During this window, you can enroll in any Medigap plan without medical underwriting, regardless of health history. Outside this window, insurers can deny you coverage or charge more based on pre-existing conditions.

Medicare Advantage is the alternative. If you don't buy Medigap, you might enroll in a Medicare Advantage plan (Part C) instead, which combines Part A, B, and usually D coverage through a private insurer. Advantage plans often have lower premiums than Original Medicare + Medigap + Part D, but they include networks, prior authorizations, and different out-of-pocket structures. This is a fundamentally different choice with different trade-offs.

Costs vary dramatically. Two identical plans from different insurers can have monthly premiums that differ by $50 or more. Getting quotes from multiple carriers is essential, not optional.

What Medigap Doesn't Cover

Understanding gaps in Medigap coverage is equally important. None of these are covered: long-term care, dental, vision, hearing aids, or most routine eye exams. Some Medigap plans include limited coverage for foreign travel emergencies. Always check the specific plan's benefits document.

The right Medigap plan depends on your health profile, budget, state of residence, and personal risk tolerance. The landscape is standardized and transparent—what varies is the price and your individual needs. Getting quotes, reviewing the plan letter benefits carefully, and understanding your enrollment window will position you to make a decision aligned with your circumstances.